fix(table): Handle nullable struct with Required Field

[zeroshade]

fixes #398

Have toRequestedSchema use the new NewStructArrayWithFieldsAndNulls function to correctly propagate null info and handle required fields within a nullable struct.

[zeroshade]

@EthanBlackburn please take a look and try this out when you get a chance. Thanks!

[EthanBlackburn]

@zeroshade it works! 🥳